The main task of my plugin is to display thumbnails quickly (small), and when you click on them, show large copies in a lightbox. If you don’t need a lightbox, then it’s easier for you to use the native gallery.
on your page, the native gallery displays pictures in their original size (1600x1063px), which is beautiful but not welcomed by search engines.
But you can always change the settings for thumbnails, as I said in my first answer (above) and increase the Medium size to 1600×1600 px and the Large size to 3000x3000px, and then my plugin will show the same pictures as a native gallery (but this is not the right way initially)